Enhance WebSocket server connection management and error handling

- Introduce connection time tracking for WebSocket users to monitor connection duration.
- Implement user ID management to allow dynamic updates and removal of connections based on user ID changes.
- Add functionality to retrieve active connections, including unauthenticated ones, for administrative purposes.
- Improve error handling during connection closure and ensure proper cleanup of connection entries.

src/websocket_server.h

@@ -22,6 +22,7 @@ struct WebSocketUserData {
     bool pongReceived = true;
     std::queue<std::string> messageQueue;
     std::mutex messageQueueMutex;
+    std::chrono::steady_clock::time_point connectionTime;  // Zeitpunkt der Verbindungsherstellung
     std::chrono::steady_clock::time_point lastPingTime;
     std::chrono::steady_clock::time_point lastPongTime;
     int pingTimeoutCount = 0;
@@ -48,8 +49,12 @@ private:
     void pingClients();
     void handleBrokerMessage(const std::string &message);
     std::string getUserIdFromFalukantUserId(int falukantUserId);
+    bool isMainAdmin(const std::string &hashedUserId);
+    json getActiveConnections();
+    void sendMessageToConnection(struct lws *wsi, const std::string &message);
     void addConnection(const std::string &userId, struct lws *wsi);
     void removeConnection(const std::string &userId, struct lws *wsi);
+    void removeConnectionByWsi(struct lws *wsi);  // Entfernt Verbindung aus allen Einträgen (Fallback)
 
     static int wsCallback(struct lws *wsi,
                           enum lws_callback_reasons reason,
@@ -74,6 +79,7 @@ private:
 
     std::shared_mutex connectionsMutex;
     std::unordered_map<std::string, std::vector<struct lws*>> connections;
+    std::vector<struct lws*> allConnections;  // Alle aktiven Verbindungen (auch ohne userId)
 
     std::vector<Worker*> workers;